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I'm not sure about your structure, but this checks if the command does not exists.

pawn Код:

if(!fexist(file))
    {
        SendClientMessage(playerid, COLOR_YELLOW, "[HOUSE-INFO:] This House already Exists.");
    }

Note: Do you really need 128 cells for that file string?

Also what does this do?

pawn Код:

GetPlayerPos(playerid, HouseInfo[h][hEnterX], HouseInfo[h][hEnterY], HouseInfo[h][hEnterZ]);

You should probably loop thru all houses instead.